WASP-108 b
Astrophysical Synthesis & Habitability Characterization
WASP-108 b is a confirmed gas giant exoplanet orbiting the star WASP-108, located approximately 844 light-years (258.78 parsecs) from the Solar System. First announced in 2020 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.0651% across the stellar disk), this world measures 15.132 Earth radii (1.35 Jupiter radii) and has a measured mass of 283.503 Earth masses (0.89 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.45 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 48.4 km/s.
In its orbital architecture around WASP-108, WASP-108 b completes one full revolution every 2.676 Earth days. The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1589 K (+1316°C / +2401°F) and receiving 1,360.16 S⊕ (~1,851,183 W/m²), WASP-108 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-108 is classified as a warm F-type star of spectral type F9 with an effective photospheric temperature of 6,783 K, a radius of 1.3442 R☉, a mass of 1.167 M☉, an estimated bolometric luminosity of 3.432 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.64 Gyr and a metallicity of [Fe/H] = 0.148 dex (metal-rich relative to the Sun). From Earth, WASP-108 shines at apparent V-band magnitude 11.211 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-108 |
| Spectral Type | F9 |
| Effective Temp (Teff) | 6,783 K |
| Stellar Radius | 1.3442 R☉ |
| Stellar Mass | 1.1670 M☉ |
| Bolometric Luminosity | 3.432 L☉ |
| Metallicity [Fe/H] | 0.148 dex |
| Stellar Age | 4.640 Gyr |
| Apparent Magnitude | V: 11.211 · G: 11.108 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 2.676 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 0.45 g/cm³ (48.4 km/s vesc) |
| Insolation Flux | 1360.1641 S⊕ (~1,851,183 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 844.000 LY (258.777 pc) |